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Home >> Mazda >> 2013 >> 5 Grand Touring >> Repair and Diagnosis >> Restraints >> Air Bag, SRS >> On-Board Diagnostic [Air Bag System - Two-Step Deployment Control System) >> DTC B1049, B1881, B1882, B1883, B1886 [Two-Step Deployment Control System] >> Diagnostic Procedure

Diagnostic Procedure

Step INSPECTION Action
1 INSPECT PASSENGER SIDE PRE-TENSIONER SEAT BELT CONNECTOR 
WARNING:
  • Handling the component parts improperly can accidentally operate (deploy) the air bag module, which may seriously injure you. Read the service warnings/cautions and the workshop manual before handling the air bag system components.

    (See AIR BAG SYSTEM SERVICE WARNINGS .)

    (See AIR BAG SYSTEM SERVICE CAUTIONS .)

  • Switch the ignition to off.
  • Disconnect the negative battery cable and wait for 1 min or more  .
  • Remove the B-pillar lower trim. (See B-PILLAR LOWER TRIM REMOVAL/INSTALLATION .)
  • Inspect the passenger-side pre-tensioner seat belt connector. (Corrosion, damage, and disconnected pins)
  • Is there any malfunction of the passenger-side pre-tensioner seat belt connector?
Yes Replace the passenger-side pre-tensioner seat belt wiring harness.
No Go to the next step.
2 INSPECT WIRING HARNESS BETWEEN SAS CONTROL MODULE AND PASSENGER-SIDE PRE-TENSIONER SEAT BELT 
NOTE:
  • Inspect for continuity while shaking the wiring harness between the SAS control module and passenger-side pre-tensioner seat belt.
  • Is the wiring harness normal?
Yes Go to the next step.
No Replace the wiring harness between the SAS control module and the passenger-side pre-tensioner seat belt.
3 INSPECT THE WIRING HARNESS BETWEEN THE SAS CONTROL MODULE AND PASSENGER-SIDE PRE-TENSIONER SEAT BELT FOR A SHORT CIRCUIT TO THE POWER SUPPLY 
  • Connect the negative battery cable.
  • Switch the ignition to ON with SAS control module connector and passenger-side pre-tensioner seat belt connector disconnected.
  • Measure the voltage of SAS control module connector terminals 2A and 2E of SAS control module harness side connector.
NOTE:
  • Measure the voltage while shaking the wiring harness between the SAS control module and passenger-side pre-tensioner seat belt.
  • Is the voltage measured?
Yes Replace the wiring harness between the SAS control module and the passenger-side pre-tensioner seat belt.
No Go to the next step.
4 INSPECT PASSENGER-SIDE PRE-TENSIONER SEAT BELT 
  • Switch the ignition to off.
  • Disconnect the negative battery cable and wait for 1min or more  .
  • Connect the SST (Fuel and thermometer checker)  or apply 2 ohms  resistance to the passenger-side pre-tensioner seat belt connector terminals A-B.
  • Set the SST (Fuel and thermometer checker)  to 2 ohms  .
  • Except for the passenger-side pre-tensioner seat belt connector, reconnect all disconnected connectors.
  • Connect the negative battery cable.
  • Switch the ignition to ON.
  • Clear the DTC for the SAS control module using the M-MDS. (See CLEARING DTC [TWO-STEP DEPLOYMENT CONTROL SYSTEM] .)
  • Perform the DTC inspection for the SAS control module using the M-MDS. (See DTC INSPECTION [TWO-STEP DEPLOYMENT CONTROL SYSTEM] .)
  • Are the same DTCs present?
Yes Go to the next step.
No Replace the passenger-side pre-tensioner seat belt. (See FRONT SEAT BELT REMOVAL/INSTALLATION .)
5 PERFORM SAS CONTROL MODULE DTC INSPECTION 
  • Switch the ignition to off.
  • Disconnect the negative battery cable and wait for 1min or more  .
  • Disconnect the SST (Fuel and thermometer checker)  or the 2 ohms  resistance.
  • Connect the passenger-side pre-tensioner seat belt connector.
  • Connect the negative battery cable.
  • Switch the ignition to ON.
  • Clear the DTC for the SAS control module using the M-MDS. (See CLEARING DTC [TWO-STEP DEPLOYMENT CONTROL SYSTEM] .)
  • Perform the DTC inspection for the SAS control module using the M-MDS. (See DTC INSPECTION [TWO-STEP DEPLOYMENT CONTROL SYSTEM] .)
  • Are the same DTCs present?
Yes Replace the SAS control module.
(See SAS CONTROL MODULE REMOVAL/INSTALLATION .)
No DTC troubleshooting completed.